Apparatus for telephone installations.



U, A. SIMPSON, i APPARATUS PonTBLEPoNB INSTALLQJIONQ.

AP'PLIOATION FILED DEO. 15, 1904.

y Patentd 0G15.13,1908.

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SUPPLY (JOMPAN Y,

No; 901, 127. v Specification T all 'whom 'it may con cern:

lie it known that I, (lnAuLus A. SIMrsoN, a citizen of the United States, residing in (,hieago, county ot (ook,.and State ot Illinois, have invented certain new and useful Improvements in Apparatus for Telephone Installations, ot' which the following is a specication. l

My invention relates to improvements in that portion ot a telephone installation known as a distributing frame and particularly to that part of the frame known as the arrester strips, and it consists, generally speaking, in the provision ot etiicient, means whereby thc cross connections in the distributing frame may be conveniently made.

In modern large telephone exchanges a distributing frame is always provided to which the street cables are mnn'iected on one side and the switchboard cables on the other; then by means ot' short, twisted pairs of wires known as juniper wires or jumpers any nected with any street end to tliereby form a -eompletc circuit. l The terminals of such lines `on one side of the traine are usually in the form ot' arr ster strilis which carry the protective devices or arresters of Various kinds for the protection of the telephone line circuits. These strips comprise a tlat mounting plate which is electrically connected with 'round and upon the two sides of which )unched sets of springr strips are mounted flatwse, theopposite set the two sides respectively ot' the same line and the arresters being held in place by springs. Such an arrester strip 1s disclosed in the patent to Kaisling. Agranted December' 30, 1902, No. 717,212. With this arrangement the line wires trom either the switchboard or street cable. are permanently cured to the correspondingr springs of the opposite sets andthe cooperatingV springs are secured to the cross ,onnectinr wires. VVit-h former arrangements it was thus necessary to secure the end of one of the jumper wires of each twisted pair to the terminal oi" the proper spring on one side of the strip und the other wire of the pair to the corresponding spring on the other side of tlie plate. This is ini'eonvenient, particularly in view of the fact that these connections are 'soldered and must be made by means of a soldering iron.

In my improvements I bringthe corre` switchboard end ot' a circuit may be con-v of Letters Patent. Application filed December 15, 1904. Serial No.

l i i l s Ondine' terminals out to one UNITED STATES PATENT OFFICE. l

CHARLES A. SIMPSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO KELLOGG SWITGHBOARD du OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

APPARATUS FOR TELEPHONE AINSTALLATIONS.

Patented Oct. 13, 1908.

side of the strip whereby the connections aul readily made at said side thus making itunnecessary to reach into the other side ot' the strip among'the various wires and connections every time it is desired to change a. eonnection. In carrying out my invention I place in the hunched set of arrester springs an auxiliary the rear to forma terminal similar to'that ot the springs, and permanently connect said strip with the proper spring on the other side of the plate by means of a cross-connectink;r wire or similar conductor soldered to each, this beingr readily done in he sho before the arrester strip is installed In practice it is only necessary toconnect the juniper or other wires to the two terminals on the saine side 'of the arrester strip in order to make the complete connecti'onwith the lines, and which' is easily done since both terminals are accessible.

The invention is illustrated in the panying drawinr in which the same reference letters Ydesignate like parts in the various views and in which:

LFigure 1 is a diagram of the distributing trame provided with arrester stri 3s of my invention; Fig. is a side View o said arrester frame and Fig. 3 is a plan View ot' a modification ot' thc-arrester strip shown in Fig. 1.

il CCOIII- s being included in i Referring to Fig. 1 and Fig. 2, 2 indica-tes the complete arrester strip which is mounted at one side of the distributing frame in front ofy the jumper strip 3 in the rear of which the cable 4 is located. The corresponding terminal strip 5 is placed at the other side of the frame and .the two, that is the terminal strip and the jumper strip, are connected together-'by the horizontal bras (i shown in Fig. 2. The whole frame is supported by the usual vertical member 7 also shown in Fig. 9.. A cable 8 is located inside of the terminal strip 5 and its conductors are brought out to the terminals 9 and 10 insulated from cach other and carried by the said strip This cable 8 may be either the cable leading to the switchboard or the cable leading into tht` street. The wires of this cable are permanently connected as by soldering with the ends of said terminals 9 and' 10Q The arrester strip comprises a mounting plate 11 suitably secured to the idistributing frame and'upon the opposite or dead strip which projects to i sides of v'hich the arrester springs lo- 'cated, the opposed sets of springs being clamped together and upon the plate by bolts 12 whlch pass through the plate and through the' sets. The two outer springs 13, 14 and 13a, 14a of these sets carry the usual sneak cmrrent,:irrcsters 15, 15 in their free ends; the third springs 1G hold the' lightning arrcsters 17 between their free ends and extenslon 18 of the mounting plate 11, while the fourth springs 19. are normally insulated but are adapted to be pressen Wto contact with the plate 11 by either We springs 14, 14gl or 16 when they are not restrained by their res ective arresters. The

detail construction ot such an arrester stripA is more fully shown and described in the patent to Kaisling, above referred to.

The Wires of the cable 4, which may be either the street cable or the switchboard cable, are taken out in pairs since they represent the two sides of the telephone line and are connected to the second springs 14 and 14 of the opposite sets. For instance, the wires 19 and 20 are connected respectively to springs 14 and 14", the circuit being thence extended through the' sneak current arresters 15 and 15a and thence to outer springs 13 and 13a. The connection of the Wires 19 and 20 to the said springs is permanent and does'not require to be cl'ianged after the installation is made.

In order now to be able to connect the two ends of the telephone lines in any manner it is necessary to have means for readily connecting the terminals 9 and 10 of the terminal strip 5 with the outer springs of the opposed sets of springsion the arrester strip i This is done through the medium of jumper Wires such as at 21 and 22 which are usually' a twisted pair of wires, one end of the pair being readily soldered to the ends of terminals 9 and 10 as shown, and thence contini ing through a jumper ring 23 suitably mounted on the distributing frame and thence through the jumper strip 3 to the tere minals of springs 13 and 13Il of the arrester strip 2.. In order to avoid the necessity of connecting the jumper wi: 21 to the spring 13 direct, an lauxiliary or dead spring 24 is included in the bunch of springs upon. the outer side of the plate 11, and is perinanently connected with the terminal of the spring 13 upon the other side of the plate, preferably by means of the wire conductor 25 which may be conveniently soldered at its opposite ends to the said terminals 13 and Q4 before-the arrester Istrip is taken from the shop. Now when i 'is the desire to connect t-he springs `and'l 131` with the respective f jumper Wires 21 and 22 it is only necessary to solder said wires to the terminals 24 and 13 which are upon the same side of the arrester strip 2 and are accessible for such purposes.

In Fig'. the side view of the arrester strip is shown from which 1t 1s evident that the of arrester springs are placed close'together side by side upon the mounting plate 11, and from which it is scen that. the dispo sition ofthe connecting tern'nnals upon one side or' the plate greatly facilitates the con- 'y nesting and disconnecting ofV the jumper wires at tl'rat side oit.' the"l"iivne.

The plate 11 iin Fig. i shown grounded as at 115 While a battery 3G, alarm 37 and switch 38 are adapted to be included in a local circuit by the closing' of springs 19 against the plate No. 11.

In Figa' :in additional :n.ixiliary or dead strip itl-'is provided in connection with the of rprings upon the opposite sideof the plate '11 and which is connected by means of a terminal conductor 31 with the spring 14 of the opposite set, whereby the cable conductors 19 and 2() may both be connected with the respective springs upon the same side of the arrester strip 2 as in the case of the jumper wires, only upon the other side. This arrangement of the line connection, (.it will be understood, is not so essential as that described with re't'erenceto Fig. 1, as the cable wires are seldom, il? ever., changed after once being connected to their respective ter,- minals.

' From the foregoing it evident that the i invention renders the making of connections on the distributing frame extremely simple and that the arrangement of the extra or dead strips in the sets of springs is an ellcient and economical method of acconlplishing the de sired result.' It is apparent thatvvarious changes and modifications may be made in the specific details of the invention Without departing trom thc scope or p1 :.ciple of the same, li'ence I do not desire to be limited in all respects to those shown and described. But

Having thus described nly invention what l claim and desire to secure by Letters Patent is:

1. In a telephone installation, the combil `nation with a mounting plate, of sets of arrester springs mounted on each side of said plate opposite one another, the opposed sets serving the respective, sides of the same telephone line, terminals for the springs to enable the same to be connected in the electric circuits, auxiliary terminals on each side ot plate; s'aid springs and auxiliary strips hav- 1n projecting terminals to which the wires o the circuits may be connected, the projecting terminal of said auxiliary stripin eachset being electrically connected to the desired `spring of the'opposite set,4 whereby the similar circuit connections with springs of the -opposite sets may be made on the same sidel of the )latcvas said auxiliary strips, silbstan'tial y as described.

3. In apparatus for a telephone installation, the combination with a mounting plate, 0f hunched sets of arrester-holding springs mounted upon opposite sides of the said p'1ate,.the sets that are opposite' beinl for the respective sides of the same line, sai springs having projecting terminals to which the wires ofthe circuits are adapted to be connected, anaiixiliai'y stripin each set on one sidel o f the plate, said auxiliary stri p alsohaving" a projecting terminal, rand a wire or like conductor connected. between said auxiliary st rip and a spring of the opposite set, whereby to permit the ready con. nection of the latter slpring, on the other side of the mounting p ate, substantially as described.'

' 4. In a telephone installation, the combination with a mountin plate, of setsof ar rester springs on opposite sides of said late, the op osite springs serving the di erent 'sides o the same telephone line, an auxiliary terminal mounted upon oneside of said plate and having aconductor cross-connected to the terminal of an arrester spi-ino on the oposite side of said plat-e, wher'by the Vtwo iimbs of the telephone line may he connected with en the 'same side of said mounting plate, said cross-connecting conductor being exposed and unassociated with the means for retaining said springs in position, substan-v -tially as described.

5. Inl a telephone installation, the combi'- nation with a mountin plate, of sets of arf rester springs on opposite sides of said plate,

i of the same telephone line, auxiliary termi` nals mounted upon the opposite sides of said plate and having conductors cross-connected to the terminals'of arrester springs on the opposite sides of said plate, whereby the two limbs of the telephone line may be connected with on the same sideof said mounting plate, said cross-connecting rconductors being exposed and unas'sociated with the means for retaining said springs in position,I substantially as described. f Y (i. In a telephone installation, the combination Witha mounting plate, of 'sets of arrester springs secured to the opposite sides of said plate,l the opposite springs serving the different sides of the same tele hne line, said springs extending beyond tlge edge of said mounting plate, an auxiliary terminal j.-

of said plate, the opplositc sprin sservin the different sides of t e saine te e hone ine, said springs extending beyond t e edge of4 4said mounting plate, an auxiliary terminal mounted similal to said springs and also ex'- tending beyond the edge of said late, and a conductor connecting the exten ed end of said auxiliary terminal with the extended end of one' of the springs upon the opposite side of said plate, substantially afs described. In witness whereof, I hereunto subscribe my name in the presence of two witnesses.

ROBERT Lewis AMES, -Eni'rrr F. GRIER. 

